What makes you think Romney would nominate conservative Justices?
His track record, as well as the track record of previous moderate Republican Presidents, argue against such an appointment.
Three things (two regrading Romney, one about voters):
1) It's a safe bet that he's not going to nominate the rabidly liberal types that obama has and is going to again, if he gets the chance.
2) Romney is a political wind sock, not a ideologue, like obama. With a more conservative Congress, and pressure from the right, his nominees will most likely be to the right of center. You can not say that about obama.
3) Even if you do not like Romney; he's not my first pick, taking a small step in the right direction is better than helping push the country off the abyss.
Look, this isn't personal salvation...picking the lesser of two evils is OK, and WILL help stop, or at least retard the downward slide the country is in.
Fight every step of the way, or abdicate the field: Small victories, or big loses...the choice is yours.